Documentation writer run for Jaah

Docs-writer run. Follow apps/docs/WRITER.md on develop. Do each item that is due, all in ONE PR: 1. Screens: one console feature's reference page. 2. Guides: one Get started, Using Jaah or FAQ item. 3. Changelog: the next batch of prod promotions 4. Reference: the Jaah API and Real-time reference against the code. Sign in only through the capture helper. Nothing due: end with no PR.

Docs-writer run: Agents guides and screenshots refreshed, credential and Gmail API params added. Fixed the lane failure (owners description over 3 sentences). Quick gate green; PR #6788 queued at b50df9b4d. Memory: none applied